易混淆的单词： SACsSACS

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The fry have hatched and have huge yolk sacs .

南联盟已孵化和巨大的卵黄囊。

Copd inflames the bronchial tubes and the tiny sacs called alveoli that line the lungs , making them less flexible and elastic .

copd能使支气管和排满肺部的叫做气泡的小型气囊发炎，从而使他们失去弹性和柔软性。

His models suggest that air sacs would blur differences between vowels , making it hard to form distinct words .

他的模型提出了这样一个观点：气腔会模糊元音之间的区别，难以形成发音清晰的词汇。

Bulbous yolk sacs provide nourishment .

球根卵黄囊提供营养。

Many frogs amplify the sound of their voices using special sacs in their throats .

许多蛙类动物利用其喉内特殊的囊将声音放大。